• Title/Summary/Keyword: AMLCD

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Development of High Performance Backlight Unit Employing EEFL

  • Yoo, Hyeong-Suk;Kang, Moon-Shik;Lim, Jong-Sun;Lee, Keun-Woo;Oh, Weon-Sik;Park, Jong-Dae;Kang, Sung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.835-837
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    • 2002
  • The 17" Backlight Unit (BLU) employing twelve EEFLs (External Electrode Fluorescent Lamp) has been developed for LCD-TV The characteristics of the EEFL BLU without dual brightness enhancement film (DBEF) were equivalent to those of CCFL (Cold cathode Fluorescent Lamp) BLU employing eight CCFLs with DBEF. Luminance, power consumption and uniformity were 12,000nits, 32watt and 80%, respectively. The inverter of EEFL Backlight Unit is composed of 2 transformers and driven by the sinusoidal waveform.

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High Performance OCB Panel Driven less than 5V for Multi-media Application

  • Chang, H.S.;Lee, C.H.;Ryu, J.J.;Kim, M.S.;Ahn, S.H.;Kim, K.H.;Kim, S.S.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.914-917
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    • 2002
  • We have obtained high performance and low voltage driving OCB panel by reducing the critical voltage and retardation matching between liquid crystal layer and compensation films. The critical voltage in the panel has been minimized by flattening color filter layer and optimizing a rubbing process. In addition, an appropriate retardation of the film and LC layer has scanned to achieve low driving voltage and high transmission. The proto-type 17" WXGA OCB panel has demonstrated with less than 5V drive and over 80 degree for all viewing direction except for rubbing direction with over 90% of TN light efficiency.

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New Material Architecture and Its Process Integration for a-Si TFT Array Manufacturing

  • Song, Jean-Ho;Park, Hong-Sick;Kim, Sang-Gab;Cho, Hong-Je;Jeong, Chang-Oh;Kang, Sung-Chul;Kim, Chi-Woo;Chung, Kyu-Ha
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.552-555
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    • 2002
  • In order to achieve higher performance and low cost a-Si TFT-LCD panel, new material architecture and its process integration for a-Si TFT array manufacturing method were developed. Material combination of low resistant dry-etchable metal and new pixel electrode under currently adopted 4 mask process made it possible to get more-simplified manufacturing method and better device performance for the a-Si TFT-LCD application. Proposed 4 mask process architecture with optimized wet etchants and dry etching process was applicable to various devices such as notebook, monitor and TV.

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Development of New LTPS Process

  • Yi, Chung;Park, Kyung-Min;Choi, Pil-Mo;Kim, Ung-Sik;Kim, Dong-Byum;Kim, Chi-Woo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1024-1026
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    • 2004
  • We have developed the five mask $PMOS^1$ and the six mask CMOS process architecture for poly-Si TFT. In order to have a competitive process with that for a-Si TFT, the simple co-planar electrode structure whose data line electrode and pixel electrode are on the same plane was adopted. In addition, RGB + White four color $technology^2$ were applied to achieve high aperture ratio and transmittance. Using the aforementioned process architecture and four color technology, 2.0 inch qCIF transmissive micro-reflectance (TMR) device was successfully fabricated.

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PVA Technology for High Performance LCD Monitors

  • Kim, Kyung-Hyun;Song, Jang-Geun;Park, Seung-Bam;Lyu, Jae-Jin;Souk, Jun-Hyung;Lee, Khe-Hyun
    • Journal of Information Display
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    • v.1 no.1
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    • pp.3-8
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    • 2000
  • We have developed a high performance vertical alignment TFT-LCD (Thin Film Transistor Liquid Crystal Display), that shows a high light transmittance, and wide viewing angle characteristics with an unusually high contrast ratio. In order to optimize the electro-optical properties we have studied the effect of cell parameters, multi-domain structure and retardation film compensation. With the optimized cell parameters and process conditions, we have achieved a 24" wide UXGA TFTLCD monitor (16:10 aspect ratio 1920X1200) showing a contrast ratio of over 500:1, panel transmittance near 4.5%, response time near 25 ms, and viewing angle higher than 80 degree in all directions.

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A New Evaluation Method of Reflective LCDs

  • Byun, Jin-Seob;Nam, Seok-Hyun;Park, Gi-Chang;Ju, Jin-Ho;Kim, Jang-Sub;Kang, Sung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.852-855
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    • 2002
  • Quality of the reflective LCD as a display is strongly influenced by the environment where the display is evaluated. Up to now, several methods for the evaluation of the reflective LCDs have been proposed. We have developed a new method in which the optical characteristics of the reflective LCDs from the spot light and the diffuse light can be obtained at the same time. The results obtained in our experiments by using the new method showed a good agreement with those evaluated at office and outdoor environments.

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Liquid Crystal Mixtures of High Response Time and High $T_{NI}$ for LCD-TV Application

  • Ban, Byeong-Seob;Kim, Bong-Hee;Seo, Bong-Sung;Yun, Yong-Kuk;Sakong, Dong-Sik;Chung, Kyu-Ha;Kim, Yong-Bae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.498-499
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    • 2002
  • In In order to develop liquid crystal mixtures of high response time and high nematic-isotropic transition temperature ($T_{NI}$) for LCD-TV application, novel liquid crystal molecules with a fluoro-isothiocyanate moiety were synthesized. They showed remarkably high $T_{NI}$ over 200 $^{\circ}C$, wide mesophase range of 170 $^{\circ}C$, high dielectric anisotropy of 14 and high optical anisotropy of 0.19. New LC Mixtures of the high $T_{NI}$ ($85{\sim}100 ^{\circ}C$) and fast response time ($8{\sim}10ms$) were blended with the novel fluoro-isothiocyanate containing LC molecules, phenylcyclohexanes, bicyclohexanes and ester compounds. It was also studied on optimum pitch of liquid crystal for high speed twisted nematic LCD-TV applicaton. The LC mixtures show a fast speed of the below one frame rate in real 17" TV panel.

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Liquid Crystal Mixtures of High Response Time and High $T_{NI}$ for LCD-TV Application

  • Ban, Byeong-Seob;Kim, Bong-Hee;Seo, Bong-Sung;Yun, Yong-Kuk;Sakong, Dong-Sik;Chung, Kyu-Ha;Kim, Yong-Bae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.413-414
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    • 2002
  • In In order to develop liquid crystal mixtures of high response time and high nematic-isotropic transition temperature ($T_{NI}$) for LCD-TV application, novel liquid crystal molecules with a fluoroisothiocyanate moiety were synthesized. They showed remarkably high $T_{NI}$ over 200 $^{\circ}C$, wide mesophase range of 170 $^{\circ}C$, high dielectric anisotropy of 14 and high optical anisotropy of 0.19. New LC Mixtures of the high $T_{NI}$ (85${\sim}$100 $^{\circ}C$) and fast response time (8${\sim}$10ms) were blended with the novel fluoroisothiocyanate containing LC molecules, phenylcyclohexanes, bicyclohexanes and ester compounds. It was also studied on optimum pitch of liquid crystal for high speed twisted nematic LCD-TV applicaton. The LC mixtures show a fast speed of the below one frame rate in real 17" TV panel.

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The Compensation of Pixel Voltage Error for a-Si TFT LCDs Regarding the Input Gamma Voltage

  • Kang, Seung-Jae;Lee, Jun-Pyo;Park, Young-Bae;Moon, Hoi-Sik;Kong, Hyang-Shik;Kim, Kyung-Seop;Kim, Sang-Su;Kim, Su-Ki
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.560-562
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    • 2002
  • The liquid crystal(LC) pixel capacitance Clc, which varies as a function of applied pixel voltage, is a main factor of pixel voltage errors on input gamma voltage, and therefore of the electro-optics(E-O) characteristics of LC pixel for a-Si TFT LCDs. The pixel voltage error(${\Delta}$Vp) for input gamma voltage was simulated for 14.1 inch diagonal XGA panel. An agreement between the experimental results and simulation was satisfactory for the gamma voltage compensation, ${\Delta}$Vp of the input gamma voltage. The proposed compensation method was successfully introduced to a 14.1 inch diagonal XGA panel, and a remarkable improvement of image sticking was achived.

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The Development of 12.1' SVGA Reflective Color Thin Film Transistor Liquid Crystal Display with The New Structured Reflector and Optimized Optical Films

  • Shin, Jong-Eup;Joo, Young-Kuil;Jang, Yong-Kyu;Kang, Myeon-Koo;Souk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.19-20
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    • 2000
  • We have developed the 12.1" SVGA reflective type color TFT-LCD(Thin Film Transistor - Liquid Crystal Display) with the high aperture ratio and well designed reflector for the applications such as mini note PC, Note PC and electronic book. The panel shows the high reflectance(30%) and contrast ratio(20:1) resulted from optimizing the optical films and designing the embossing shaped reflector. By improving the chromacity, the color reproducibility was increased up to 20%. As removing the backlight unit, we reduced the power consumption, thickness and weight of the panel to 0.8W, 2.2mm, and 250gram, respectively. According to the above performances, we have obtained fabrication process for mass production, and furthermore, could have access to fast market launching.

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